Apparatus for grinding the needles of die drilling machines



Oct. 20, 1953 E. J. BARTELL APPARATUS FOR GRINDING THE NEEDLES OF DIE DRILLING MACHINES- 2 Sheets-Sheet 1 Filed 001;. 4, 1950 INVENTOR. ERNEST J BART-ELL ATTORNEY Oct. 20, 1953 .E. J. BARTELL 2,655,768

"APPARATUS FOR GRINDING THE NEEDLES OF 01E DRILLING MACHINES Filed Oct. 4, E350 2 Sheets-Sheet 2 INVENTOR. ERNEST J. .BAQT'ELL ATTORNEY Patented Oct. 20, 1 953 UNITED STATES PATENT oFFlcE APPARATUS FOR GRINDING THE NEEDLES OF ZDIE DRILLING MACHINES Ernest J. Bax-tell, Rome, N. Y,.

Application October 4, 1951),, SerlalNo. 188,346

5 Claims. 1

My invention relates to grinding apparatus and particularly to grinding apparatus for grinding the points on needles used in die drilling machines, particularly drilling machines for drilling dies of diamond, carbide and other hard materials.

In drilling die holes in hard materials, such ,as diamonds, for example, it is essential that a sharp oint be maintained on the needle; and it is equally essential that the point of the needle be tapered a'tthe proper angle, so as to produce a bore in the die of the desired shape, the tolerances allowed commercially with respect to die bores being extremely small.

Prior to my invention it has been customary in this industry to remove the needle from the die drilling machine, set the needle up in a grinding machine, grind -the point, and then replace the needle in the drilling machine. Not only is this operation time-consuming, but it is unsatisl'factory because of the dilhculty experienced and skill required in grinding the needle point in a fmercial scale, becomes a very serious problem.

The present invention provides needle grinding apparatus which reduces the *dlificultles hereto- Tore met with to the very minimum.

In general, my apparatus, which is self-contamed, comprises a motor mounted on the die "drilling machine and carrying the grinding mem- "ber. The needles are ground without removing them from the die drilling machine, means "being provided whereby the motor may be oscillated in the grinding operation; the motor may be adrusted -lengtl-l'wise, toward and away from the needle; the angle of the face of the grinding member to the needle is adjustable, so as to accommodate the grinder to needles or various tapers: and the grinder is so mounted on the die drilling machine that it may be moved bodily I along the machine, selectively to grind any needle of the needle bank composing the drilling machine to any desired taper.

A scale, calibrated in degrees, forms part of the grinding machine, so that the angularity of the grinder to the needles and, hence, the taper ofthe needles may be determined with great accuracy.

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It will "be appreciated that my apparatus presents a great advance in this art in thatit is unnecessary to remove the needles "from the drilling machine, and any one needle or the bank can be ground to the desired degree of accuracy without disturbing or interrupting the operation of any of the other needles.

In the accompanying drawings, wherein l have illustrated an embodiment of my invention,

Fig. 1 is a side elevation in part section :showing my nee-die grinder applied to a die drilling machine;

Fig. 2 is a plan view of Fig. 1;

Fig. 3 is a section on the line 3-4 of "Fl- 1; and

Fig. 4 is a front elevational view of the grinder in place on a die drilling machine.

Referring to "the drawings in detail, .2 desighates the spindles, I the needles, 'and 15 the the holders of a die drilling machine. Inasmuch as the present invention is directed to grinding apparatus for grinding the "points of the needles l, the details of the die drilling machine are more or less diagrammatically illustrated, and parts of the same have been omitted for clarity of illustrat'io'n.

I have illustrated a bank of six needles, but this number is purely arbitrary, and the may be composed of any number of needles that may be found practical.

The needles are rotated at very high speeds, 8 designating a driving pulley with which each of the spindles is equipped.

As above pointed out, the primary'object of my invention is to provide grinding equipment whereby the needles 1 of the needle bank may be ground without removing the needles from the drilling machine, and to providefor grinding any needle oi the bank to any taper desired without interrupting the drilling operation of the other needles.

My grinding apparatus comprisesa smallhighspeed electric motor ill, the shaft 12 of which is equipped with a chuck 14, or other means, whereby a grinding member 15 may be attached to the motor shaft.

The motor ll) 'is'laterally oscillatable,..as will be brought out later, and to provide for this motor movement, I equip my grinder with a short rod or pintle 18, on which the motor is manually oscillated. This pintle lies above the motor and extends lengthwise thereof, as apparent from the drawings.

The inner end .of the pintle 18 is pivoted to a bifurcated block '2 0, the pintle lbeing pivotal with respect "to this block about a pivot pin 22, which passes through the two arms of the bifurcated block and the pintle transverse to the axis of the pintle.

Mounted on guides 24, which are provided in the upper face of the block 20 and extend vertically thereof, is a mounting block 26. This block is vertically adjustable on the guides 24 through the medium of a rotatable threaded member 28, which is 'threadedthrough the mounting block, and the lower end of which is anchored to the bifurcated block 20.

The rear face of the mounting block 26 is grooved, as seen at 30, so that the block may be slidably mounted on mounting bar or rail 32, which is provided on the drilling machine just below the pulleys 8. While the rail 32 fits the groove in the mounting block with a fairly close fit, while permitting the block to be slid along the bar, I prefer to insert a flat spring 34 between the edge of the rail and the block, which will tend to steady the block in the grinding operation. A

It will be apparent from the description thus far given that the angular relation between the block 20 and mounting block 26 is fixed, but, as pointed out, the pintle l8 is capable of being pivoted with respect to block 20 through the medium of the pivot pin 22.

For indicating the setting of pintle l8 and, as will be brought out later, the setting of the grinding element IS with respect to the needles 4, I rigidly attach an indicator 36 to the block 20, this indicator being calibrated in degrees and cooperating with a pointer 38, which is rigid with the pintle I8.

40 designates a motor-carrier or hanger for the motor In, this carrier being attached to the motor by a flexible metal strap 42. This strap is permanently attached at one end 63 to the motor-carrier and is passed about the motor housing, and its other end releasably attached to the motor-carrier by threaded member M. By simply loosening the member 44, the strap 42 is released, and the motor and grinding member may be removed from the holder, if desired. It will be understood that normally the strap 42 grips the motor I 0 rigidly to the holder 40, so that in effect the two are integral.

The holder 40, in addition to carrying the grinder motor, also provides bearings for the pintle l8, the holder being provided with projections 45 for this purpose.

The motor holder 40 is movable lengthwise of the pintle l8, and a stop bushing 46 is provided on the outer end of the pintle, which cooperates with a lock nut 48, threaded on the extreme outer end of the pintle.

It will be appreciated that in practice the grinder may be mounted on the mounting rail 32 of the die drilling machine and left there permanently.

When one of the needles, say the needle designated 50, of the drilling machine requires sharpening, the spindle is raised to raise the needle out of the die holder and the grinder moved along the rail 32 until the grinding member 32 is adjacent the needle. A rest 52, which is mounted upon one of the guides 24, is swung around until it lies beneath the driving pulley 54, so that the needle will remain in its raised position.

The needle 50, it will be appreciated, is still being rotated, as well as all of the other needles of the bank.

The pintle I8 has been previously rocked about its pivot 22 to set the grinding element H5 at the proper desired angle for the point of needle 50, and locked merely by tightening threaded pivot 22.

The operator then merely oscillates the motor laterally by hand about the pintle l8 back and forth across the needle.

After the grinding operation is finished, the grinder is merely pushed to one side and the motor I!) shut off. The grinder may be left at all times suspended from the mounting bar or rail 32, or, if desired, it may be slipped off the bar end and transferred to another drilling machine.

It will be appreciated that, because the grinder is completely self-contained, it may be used for grinding any of the needles of a bank, and because of its adjustability each needle may be ground to a different taper, if the dies being drilled require it.

It will be appreciated furthermore that the grinding element and its driving motor not only may be oscillated laterally but may be adjusted vertically of the needle through the medium of member 28; are capable of movement toward and away from the needle; and may be pivoted to vary the angle of the face of the grinding element It to the needle to vary the taper to which the needle point is ground-all without interrupting the drive of the needle being ground or of any of the other needles of the bank. It will be appreciated also that, by providing an indicator, calibrated in degrees, for setting the grinding angle, the needles may be ground with maximum accuracy and with the minimum of effort and skill on the part of the operator,

It is to be understood that changes may be made in the details of construction and arrangement of parts herein described within the purview of my invention,

What I claim is:

1. In combination, a die-drilling machine comprising a row of rotatable die-drilling needles; an electric motor; a needle-grinding member mounted on the armature shaft of said motor; a block carried by the drilling machine and movable along the row of needles to bring said grinding member selectively into juxtaposition to any needle of the row; a pintle extending lengthwise of the armature shaft and on which said motor is laterally oscillatably mounted, the inner end of said pintle being attached to said block for adjustment about an axis transverse of the motor for adjusting the angle between the active face of the grinding member and a needle of said row which is to be ground.

2. In combination, a die-drilling machine comprising a row of rotatable die-drilling needles; an electric motor; a needle-grinding member mounted on the armature shaft of said motor; a. block carried by the drilling machine; a pintle extending lengthwise of the armature shaft and on which the motor is laterally oscillatably mounted, the inner end of said pintle being attached to said block for adjustment of the pintle and motor about an axis transverse of the motor, said block being movable along the row of needles to bring said grinding member selectively into juxtaposition to any needle of the row, the said adjustability of said pintle and motor about an axis transverse of the motor enabling each needle of said row to be ground to any taper desired, irrespective of the other needles of the row.

3. In combination, a die-drilling machine comprising a row of rotatable die-drilling needles; an electric motor; a needle-grinding member mounted on the armature shaft of said motor; a block carried by the drilling machine; a pintle extending lengthwise of the armature shaft and on which the motor is laterally oscillatably mounted, the inner end of said pintle being attached to said block for adjustment of the pintle and motor about an axis transverse of the motor, said block being movable along the row of needles to bring said grinding member selectively into juxtaposition to any needle of the row, the said adjustability of said pintle and motor about an axis transverse of the motor enabling each needle of said row to be ground to any taper desired, irrespective of the other needles of the row; a calibrated scale rigidly aflixed tosaid block; and a cooperating pointer rigidly afl'ixed to said pintle and moving across the face of said scale as the pintle and motor are adjusted.

4. In combination, a die-drilling machine comprising a row of rotatable die-drilling needles; an electric motor; a needle-grinding member mounted on the armature shaft of said motor; a motor-carrier or hanger releasably secured to the motor; a pintle extending lengthwise of the armature shaft and on which the motor is laterally oscillatably mounted; a mounting block carried by the drilling machine and movable along the said needle bank; a second block, the inner end of said pintle being attached to and adjustable with respect to said second block about an axis transverse of the motor, to vary the angularity of the grinding member to the needles of said row; and a member threaded through the said mounting block and attached to said second block for raising and lowering the said motor and grinding member relatively to the row of needles.

5. In combination, a die-drilling machine com- 6 prising a row of simultaneously rotated die-drilling needles; a bar or rail afiixed to the die-drilling machine in front of said needles; a mounting block on said rail and movable therealong; a second block below the mounting block; a member threaded through the mounting block and rotatably connected to the second block for vertical adjustment of the second block; a motor; a grinding member carried by the motor armature shaft; a motor carrier; a pintle extending longitudinally of the armature shaft and having bearings in said motor carrier, and on which said motor is laterally oscillatably mounted; and a. pin extending transversely of the motor axis passing through the second block andthe inner end of the pintle to provide for adjustment of the motor about an axis transverse to the longitudinal axis of the motor, to adjust the angle between the grinding member and the said needles.

ERNEST J. BAR'I'EL-Ii.

References Cited in the file of this patent UNITED STATES PATENTS FOREIGN PATENTS Country Date Switzerland Aug. 17, 1911 Number Number 

